foreign/csharp/Shared/Orders.cs

using System.Text;
using System.Text.Json;

namespace Shared;
public class OrderCreated : ISerializableMessage
{
    private readonly JsonSerializerOptions _jsonSerializerOptions;

    public OrderCreated()
    {
        _jsonSerializerOptions = new JsonSerializerOptions();
        _jsonSerializerOptions.WriteIndented = true;
    }
    public required int Id { get; init; }
    public required string CurrencyPair { get; init; }
    public required double Price { get; init; }
    public required double Quantity { get; init; }
    public required string Side { get; init; }
    public required ulong Timestamp { get; init; }

    private string ToJsonPrint()
    {
        return JsonSerializer.Serialize(this, _jsonSerializerOptions);
    }

    public string ToJson()
    {
        var envelope = new Envelope();
        var env = envelope.New("order_created", this);
        return JsonSerializer.Serialize(env, _jsonSerializerOptions);
    }

    public byte[] ToBytes()
    {
        var envelope = new Envelope();
        var env = envelope.New("order_created", this);
        var json = JsonSerializer.Serialize(env, _jsonSerializerOptions);
        return Encoding.UTF8.GetBytes(json);
    }
    public Envelope ToEnvelope()
    {
        var envelope = new Envelope();
        var env = envelope.New("order_created", this);
        return env;
    }

    public override string ToString()
    {
        return $"OrderCreated {ToJsonPrint()}";
    }

}

public class OrderConfirmed : ISerializableMessage
{
    private readonly JsonSerializerOptions _jsonSerializerOptions;

    public OrderConfirmed()
    {
        _jsonSerializerOptions = new JsonSerializerOptions();
        _jsonSerializerOptions.WriteIndented = true;
    }
    public required int Id { get; init; }
    public required double Price { get; init; }
    public required ulong Timestamp { get; init; }
    public string ToJson()
    {
        var envelope = new Envelope();
        var env = envelope.New("order_confirmed", this);
        return JsonSerializer.Serialize(env, _jsonSerializerOptions);
    }

    public byte[] ToBytes()
    {
        var envelope = new Envelope();
        var env = envelope.New("order_confirmed", this);
        var json = JsonSerializer.Serialize(env, _jsonSerializerOptions);
        return Encoding.UTF8.GetBytes(json);
    }

    public Envelope ToEnvelope()
    {
        var envelope = new Envelope();
        var env = envelope.New("order_confirmed", this);
        return env;
    }

    private string ToJsonPrint()
    {
        return JsonSerializer.Serialize(this, _jsonSerializerOptions);
    }
    public override string ToString()
    {
        return $"OrderConfirmed {ToJsonPrint()}";
    }
}

public class OrderRejected : ISerializableMessage
{
    private readonly JsonSerializerOptions _jsonSerializerOptions;

    public OrderRejected()
    {
        _jsonSerializerOptions = new JsonSerializerOptions();
        _jsonSerializerOptions.WriteIndented = true;
    }
    public required int Id { get; init; }
    public required ulong Timestamp { get; init; }
    public required string Reason { get; init; }
    public string ToJson()
    {
        var envelope = new Envelope();
        var env = envelope.New("order_rejected", this);
        return JsonSerializer.Serialize(env, _jsonSerializerOptions);
    }
    public Envelope ToEnvelope()
    {
        var envelope = new Envelope();
        var env = envelope.New("order_rejected", this);
        return env;
    }

    public byte[] ToBytes()
    {
        var envelope = new Envelope();
        var env = envelope.New("order_rejected", this);
        var json = JsonSerializer.Serialize(env, _jsonSerializerOptions);
        return Encoding.UTF8.GetBytes(json);
    }

    private string ToJsonPrint()
    {
        return JsonSerializer.Serialize(this, _jsonSerializerOptions);
    }

    public override string ToString()
    {
        return $"OrderRejected {ToJsonPrint()}";
    }
}